package com.heima.app.gateway.filter;

import com.heima.app.gateway.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.Objects;

/**
 * <p>
 *
 * </p>
 *
 * @author lzt
 * @version 1.0
 * @since 2024/4/8 11:39
 */
@Slf4j
@Component
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 1. 获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        // 2.判断是否为登录
        if (request.getURI().getPath().contains("/login")) {
            // 放行
            return chain.filter(exchange);
        }

        // 3.获取token
        String token = request.getHeaders().getFirst("token");

        // 4.判断token是否存在
        if (StringUtils.isBlank(token)) {
            // 401
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        // 5. 判断token是否有效
        try {

            Claims claimsBody = AppJwtUtil.getClaimsBody(token);

            // 是否过期
            int result = AppJwtUtil.verifyToken(claimsBody);
            if (result == 1 || result == 2) {
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

            // 获取用户信息
            Object userId = claimsBody.get("id");

            // 存储到header中
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId", userId + "");

            }).build();
            // 重置请求
            exchange.mutate().request(serverHttpRequest);

        } catch (Exception e) {
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        // 6.放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        // 优先级
        return 0;
    }
}
